Privacy Policy
Effective 30 September 2026
The short version
Arc is a prediction app with no money in it. There is no betting, no wagering and no payments — you call what you think will happen, and the only thing at stake is your record.
Arc collects what it needs to run that record and nothing else. It does not track you across other apps or websites, contains no advertising SDKs, and never sells your data.
What Arc stores about you
Your account: the email address and password you sign up with, or — if you use Sign in with Apple — the identifier Apple gives us. Apple may give us a private relay address instead of your real one; that is Apple's choice and we are happy with it.
Your profile: username, display name, bio, avatar image and any social links you add. These are public. Anyone using Arc can see them.
Your calls: which option you picked on a prediction, when you picked it, and how it was graded once the world answered.
Your record: signals, streaks, and counts of correct, incorrect and voided calls.
Who you follow, and who follows you.
A device identifier: a random value Arc generates on first launch and keeps in your device's keychain. It is not your hardware ID and not an advertising ID.
Product events: a short list of named events such as opening the app or locking a call, with small technical properties. None of them carries the text of a prediction or anything from your profile.
Predictions you propose: the text you submit goes to a review queue. It is not published unless Arc publishes it.
What stays on your phone
Arc keeps a log of which cards you were shown, which you opened and which you called, labelled only by genre. It is used to order your feed.
That log never leaves your device. It is not uploaded, and Arc's servers have no copy of it.
What Arc does not collect
Your location. Your contacts. Your health data. Your calendar. Any photo other than an avatar you deliberately choose.
No advertising identifier, no third-party analytics SDK, no ad network, and no cross-app or cross-site tracking. Arc does not ask for App Tracking Transparency permission because it has nothing to track you with.
Who else sees it
Supabase hosts Arc's database and handles sign-in. Your data sits in their ap-south-1 region (AWS Mumbai).
Apple, if you choose Sign in with Apple, handles that sign-in.
Expo's push service, and only if you turn notifications on, receives a push token so a notification can reach your device.
Wikimedia Commons serves the photographs on prediction cards. Your device loads those images directly, so Wikimedia can see your IP address, as it would if you opened Wikipedia.
That is the whole list. Arc has no advertisers and no data brokers, and does not sell or rent your data to anyone.
Your controls
Delete your account at any time: Profile → Privacy & security → Delete account. It removes your profile, your follows and your login immediately.
Your past calls are kept but detached from you — your user id is erased from them. This is deliberate: the public count of how many people called each side of a prediction has to stay accurate, and a call you already locked is part of that record. What remains cannot be traced back to you through Arc.
You can change your password, reset it by email, and link or unlink a sign-in provider from the same screen.
You can change your region, which changes which predictions you are shown.
How long it is kept
Your account and profile: until you delete them.
Product events: kept while they are useful for improving the app, and not tied to your profile.
Anonymised calls: kept indefinitely as part of Arc's public record of what was predicted and what happened.
Children
Arc is not directed at children under 13, and Arc does not knowingly collect their data. If you believe a child has created an account, write to us and we will remove it.
Security
Traffic between the app and Arc is encrypted in transit. Passwords are stored hashed by Supabase's auth service — Arc never sees or stores your password. Your device identifier is held in the device keychain rather than in ordinary storage.
No system is perfect. If you find a security problem in Arc, please write to us before disclosing it publicly.
Changes
If this policy changes materially, the effective date at the top changes and the new version appears here and in the app. Continuing to use Arc after that means the new version applies.
Contact
Privacy questions, data requests and abuse reports: arcness.arc@gmail.com.